Should a person who feels his legal age does not correspond with his experienced age be allowed to change his legal age? In this paper, I argue that in some cases people should be allowed to change their legal age. Such cases would be when: 1) the person genuinely feels his age differs significantly from his chronological age and 2) the person’s biological age is recognized to be significantly different from his chronological age and 3) age change would likely prevent, (...) stop or reduce ageism, discrimination due to age, he would otherwise face. I also consider some objections against the view that people should be allowed to change their legal age and find them lacking. (shrink)